NK Needle Roller Bearings — Sizes & Specifications
The NK series is a machined-ring needle roller bearing without an inner ring — a compact radial bearing where the shaft journal is the raceway. The model encodes bore (Fw) and width, for example NK20/16 is a 20 mm bore, 16 mm wide bearing. NK bearings are standard in gearboxes, pumps and small machinery. BPK supplies the NK range listed here, factory-direct from Yandian, Shandong, for importers, distributors and OEM buyers.
Standard sizes
| Model | Bore Fw (mm) | |
|---|---|---|
| NK6/10 | 6 | Inquiry |
| NK8/12 | 8 | Inquiry |
| NK10/12 | 10 | Inquiry |
| NK12/12 | 12 | Inquiry |
| NK14/16 | 14 | Inquiry |
| NK16/16 | 16 | Inquiry |
| NK18/16 | 18 | Inquiry |
| NK20/16 | 20 | Inquiry |
| NK22/16 | 22 | Inquiry |
| NK24/16 | 24 | Inquiry |
| NK26/16 | 26 | Inquiry |
| NK28/16 | 28 | Inquiry |
| NK30/16 | 30 | Inquiry |
| NK35/20 | 35 | Inquiry |
| NK40/20 | 40 | Inquiry |
| NK45/20 | 45 | Inquiry |
| NK50/25 | 50 | Inquiry |
Model notation identifies a family, not a fixed size. Please confirm bore diameter, outer diameter, overall length, mounting, sealing, material, and load requirements with your drawing.
Every model above links straight to the inquiry form with the model prefilled — send your quantity and destination, and we prepare the quotation.
Options & matching parts
NKI is the same bearing complete with an inner ring. The heavier NA / RNA 4900 series covers larger bores and loads.
Ordering from BPK
Samples first if you need to check fit and quality; bulk and OEM orders (your logo, your box) supported. MOQ from 1 piece on standard sizes.
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